/*
*  Copyright Beijing 58 Information Technology Co.,Ltd.
*
*  Licensed to the Apache Software Foundation (ASF) under one
*  or more contributor license agreements.  See the NOTICE file
*  distributed with this work for additional information
*  regarding copyright ownership.  The ASF licenses this file
*  to you under the Apache License, Version 2.0 (the
*  "License"); you may not use this file except in compliance
*  with the License.  You may obtain a copy of the License at
*
*        http://www.apache.org/licenses/LICENSE-2.0
*
*  Unless required by applicable law or agreed to in writing,
*  software distributed under the License is distributed on an
*  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
*  KIND, either express or implied.  See the License for the
*  specific language governing permissions and limitations
*  under the License.
*/
package lemon.mvc.util;

import java.util.concurrent.atomic.AtomicBoolean;

import lemon.mvc.mvc.exception.WFException;

/**
 * 保证只执行一次
 */
public class OnlyOnceCondition {

    public static OnlyOnceCondition create(String message) {
        return new OnlyOnceCondition(message);
    }

    private final String message;

    private OnlyOnceCondition(String message) {
        this.message = message;
    }

    private final AtomicBoolean hasChecked = new AtomicBoolean(false);

    public void check() {
        if (!hasChecked.compareAndSet(false, true))
            throw WFException.newBuilder(message).build();
    }

}
